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MORPHOLOGY AND EVOLUTION
lateral folds, which pass into the short upper lip; and the nostrils are wide and patulous. The relative development of the nose and lips varies with age, as can be seen by comparing figs. 17 and 18, and with sex.
FIG. 18.—Adult Gorilla.
The lower part of the face is very prominent in the adult, because the maxillae are prognathous, the mandible is very large, and the muscles of mastication are large and powerful. In the young animal the pro-gnafchism is less marked, and the lips are not bulged forwards to such an extent as those in the adult. As the